Blade holder



July 18, 1939. J. BENDA 2,166,855

BLADE HOLDER Filed April 2l, 1938 2 Sheets-Sheet 2 James @ma @Lito/www Patented July 18, 1939 UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to a sickle blade holding apparatus for whetstone grinders.

It is an aim of this invention to provide a device adapted to be supported by a whetstone support and having means to removably support a blade to be sharpened.

More particularly, it is an object of this invention to provide a device comprising a relatively few parts which are pivotally, swivelly and slidably connected so that the blade supported thereby to be sharpened may be moved into or out of engagement with a grinding wheel and adjusted laterally thereto for sharpening various portions of the blade.

It is a further object of this invention to pro vide a device which may be economically constructed, to be very durable, and which may be readily attached to vor removed from a grinding bench. An important advantage of this invention resides in the fact that the blade will be positively supported and may readily be held rigid by the operator in proper position to sharpen the blade with a proper bevel, the device being so constructed, that it will properly adjust the blade to the grinding wheel when in engagement therewith.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawings which illustrate a preferred form of the invention, and wherein:

Figure 1 is a side elevational view showing the device attached to a whetstone bench and supporting a blade in engagement with the stone for sharpening,

Figure 2 is a top plan View of the invention,

Figure 3 is a rear elevational view of the same,

Figure 4 is a vertical sectional view taken on the line 4-4 of Figure 3,

Figure 5 is a fragmentary side elevational view showing one of the clamping members held in an upright position to receive a blade to be sharpened,

Figure 6 is a horizontal sectional View taken on the line 6-5 of Figure 5,

Figure 7 is a vertical sectional view taken on the line I-l' of Figure 6, and

Figure 8 is a sectional view taken on the line 8 8 of Figure l showing the cross-sectional shape of the periphery of the grinding wheel.

Referring more particularly to the drawings wherein like reference characters designate like or corresponding parts, I5 designates generally a whetstone wheel and II its support or bench, these parts being of conventional form and shown merely to illustrate the application of the in- Vention which will hereinafter be described.

The blade holder designated generally I2 and comprising this invention includes a pair of angle members I3 adapted to be connected by the nut and bolt fastenings I4. Members I3 are adapted to be clamped to the bench or support II as seen in Figures 1, 3 and 4. Bearings I5 are secured at either end and on the upper side of the upper member I3 to journal the opposite ends of a shaftV I6.

An arch I'I formed of angle-shaped telescopic sections I8 and I9, has a pair of apertured ears projecting from its depending ends I9 through which extends the shaft I6 and by which arch I'I is pivotally mounted. Parts I8 and I9 are provided with a plurality of equally spaced apertures 2| adapted to be aligned to receive the nut and bolt fastenings 22 to rigidly retain the arch Il in an extended or retracted position as desired depending upon the diameter of the wheel I3, as will hereinafter become more clearly apparent.

A sleeve 23 vis suitably secured in a vertical position intermediate of the upper end of the arch I'I.

A crosshead, designated generally 24 and comprising a head 25 and a depending reduce shank 2E which is swivelly mounted in sleeve 23 and held in position therein by nut 21 which engages its threaded end 28. Head 25 is provided with a longitudinal bore 29, and with slots 39 at opposite ends thereof disposed in a horizontal plane and communicating with the bore 29 as best seen in Figure 3.

Connected to the opposite ends 32 of frame 3I, are the clamping members designated generally 33. Clamping members 33, as best seen in Figures 4 and 5, comprise the jaws 34 which are rigidly secured to ends 32, and the jaws 35 which are slidably mounted on the bolts 3U which extend through corresponding openings 31 in jaws 34 and 35. Nuts 38 engage the threaded ends of bolt 36 to retain the jaws 35 in position thereon, and the bolts 36 are provided with expansion coil springs 39 which normally urge the jaws 34 and 35 away from each other.

43 designates generally a sickle blade, shown to illustrate the application of the invention, comprising a plurality of teeth 4I connected by bar 42 extending along one side thereof.

From the foregoing it will be seen, that when the arch I1 is in a position as seen in Figure 4, the frame 3i may be turned in bore 29 until its ends 32 are perpendicular with head 25, when by moving the frame lengthwise of the head 25 one of the ends 32 will engage the notch 30 to retain clamping members 33 in an upright position, as seen in Figure 5, to permit the bar 42 to be positioned between the jaws 34 and 35 and clamped therein by tightening nut 38. Bar 42 is clamped between jaws 34 and 35 as best seen in Figure 4, so that the teeth 4| project outwardly from the clamping member 33. Arch I'I is then swung toward the Wheel Il! on its pivot I6, and frame 3| is turned in bore 29 until the teeth 4I and blade 40 contact the periphery of wheel IU. Arch Il and frame 3| are adjusted until the teeth 4I aie at the proper angle to the wheel I0 for sharpening, as best seen in Figure 1. The periphery 43 of wheel Ill as seen in Figure 8 is beveled to a point to engage adjacent edges of two of the teeth 4I simultaneously, and frame 3I is sidely mounted in bore 29 so that it may be moved transversely relatively thereto to position teeth 4| relatively to wheel Ill and to move the blade laterally of the wheel after each pair of edges has been sharpened. Frame 3| may be of any desired length so that any nLunber of teeth 4I may be sharpened without removing the blade 4|! for the clamps 33 for readjustment therein, and the frame 3| is swivelly mounted by the crosshead 24 for ne angular adjustment of the blade 4U relatively to the periphery 43 of, the wheel IE) so that the teeth 4I will be ground to a proper bevel thereby. The arch II is formed of telescopic sections I8 and I9 so that it may be raised or lowered to adapt the holder I2 for use with grinding wheels of different diameters.

Clamps 33 may readily be modified to support other forms of blades than the blade 40 as shown, and various other modications and changes may obviously be resorted to and are contemplated, without departing from the spirit and scope of the invention as hereinafter dened by the appended claims.

I claim as my invention:

1. In a device of the class described, a member adapted to be removably secured to a Whetstone support, an arch pivotally supported by said member and extending upwardly therefrom, said arch being formed of extensible sections, a T- shaped member swivelly mounted on said arch and having a bore extending through its head, and a yoke slidably mounted in said bore, clamping means at each end thereof adapted to removably engage the blade to be sharpened, said device being adapted to move the blade into and out of engagement with a grinding wheel and for transverse movement of the blade relatively to the grinding wheel.

2. In a holder for blades While sharpening, an arch member pivotally mounted and vertically adjustable, a crosshead swivelly mounted at the upper part of said arch and having a horizontally disposed bore, a U-shaped member having an intermediate portion extending through said bore and pivotally and slidably mounted therein at substantially right angles to the arch member, and clamping means connected to the ends of said U-shaped member and adapted to removably engage a blade to be sharpened, said device being adapted to move a blade into and out of engagement with a grinding wheel and for transverse movement relative to the Wheel.

3. In a blade holding attachment for sharpening wheels, clamping means for removably engaging the blade, said clamping means being provided with a U-shaped supporting frame, a crosshead in which said supporting frame is slidably and pivotally mounted, a standard on which u said crosshead is swivelly mounted, said frame being slidably and pivotally mounted to move the blade laterally of and toward or away from a grinding Wheel, and swivelly mounted by the crosshead for angular adjustment relatively thereto, and said crosshead having means for holding the frame rigidly in a horizontal position away from the grinding wheel for connecting or disconnecting the blade.

4. In a blade holding attachment for sharpening wheels, a pivotally mounted extensible standard, clamping members adapted to releasably engage a blade to be sharpened, said clamping members being mounted on the opposite ends of a U-shaped rod, and means for slidably, pivotally and swivelly mounting said rod relatively to said standard for moving said blade into and out of engagement With a sharpening wheel, laterally thereof and for angularly adjusting the blade relatively thereto.

5. A blade holder comprising an extensible arch shaped member adapted to be pivotally mounted on a whetstone support, a sleeve formed in the top of said arch shaped member and disposed longitudinally thereof, a tube having a laterally projecting shank intermediate of its ends loosely mounted in the sleeve for swivelly mounting the tube relatively to the arch shaped member, a U-shaped rod having its intermediate portion slidably and swivelly mounted in the tube, and clamping elements mounted on the ends of said rod and adapted to be movably mounted thereby laterally of a whetstone, said clamping elements being adapted to detachably support a blade to be sharpened.

JAMES BENDA. 

